scholarly journals Polyvinyl Alcohol Polymer Functionalized Graphene Oxide Decorated with Gadolinium Oxide for Sequestration of Radionuclides from Aqueous Medium: Characterization, Mechanism, and Environmental Feasibility Studies

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3835
Author(s):  
Lakshmi Prasanna Lingamdinne ◽  
Janardhan Reddy Koduru ◽  
Yoon-Young Chang ◽  
Mu. Naushad ◽  
Jae-Kyu Yang
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Metal Ions ◽  
Hydrothermal Process ◽  
Thermodynamic Characteristics ◽  
Feasibility Studies ◽  
Gadolinium Oxide ◽  
Equilibration Time ◽  
Order Kinetic ◽  
Functionalized Graphene Oxide

Uranium (U(VI)) and thorium (Th(IV)) ions produced by the nuclear. and mining industries cause water pollution, thereby harming the environment and human health. In this study, gadolinium oxide-decorated polyvinyl alcohol-graphene oxide composite (PGO–Gd) was developed using a simple hydrothermal process to treat U(VI) and Th(IV) ions in water. The developed material was structurally characterized by highly advanced spectroscopy and microscopy techniques. The effects of pH, equilibration time and temperature on both radionuclides (U(VI) and Th(IV)) adsorption by PGO–Gd were examined. The PGO–Gd composite adsorbed both metal ions satisfactorily, with adsorption capacities of 427.50 and 455.0 mg g−1 at pH 4.0, respectively. The adsorption properties of both metal ions were found to be compatible with the Langmuir and pseudo–second-order kinetic models. Additionally, based on the thermodynamic characteristics, the adsorption was endothermic and spontaneous. Furthermore, the environmental viability of PGO–Gd and its application was demonstrated by studying its reusability in treating spiked surface water. PGO–Gd shows promise as an adsorbent in effectively removing both radionuclides from aqueous solutions.

Graphene/ Graphene Oxide Based Pyrimidine Hybrid Materials for Metal Ion Sensing and DFT Study

2018 ◽  
Vol 1 (1) ◽  
pp. 228-235
Author(s):  
Pramanand Kumar ◽  
Chandramika Bora ◽  
Pradip K. Sukul ◽  
Subrata Das
Keyword(s):  
Graphene Oxide ◽  
Metal Ions ◽  
Hybrid Materials ◽  
Metal Ion ◽  
Density Functional ◽  
Analytical Techniques ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Ion Sensing ◽  
Device Applications

Chemical and biological sensors are gaining wide popularity in day-to-day life and significantly help to increase the survivability by providing early warning for explosives, metal pollutant, and chemical warfare. GR analog based sensor devices have several advantages for chemical and biological sensing. The structural or chemical modifications of GR remarkably improve the properties of such device applications. Keeping this in mind, we have designed and synthesized pyrimidinedione-functionalized graphene oxide (FGO) and functionalized graphene (FG) sequentially. Synthesis of the hybrid materials was done using the simple hydrothermal method. The materials were characterized by various spectroscopic and analytical techniques. XRD study showed formation of well exfoliated GO sheets in the composite. FTIR data indicates the formation of GO-NO-Ur composites. Density functional theory (DFT) calculation was also investigated to understand the various non-covalent interactions of the NO-Ur and FGO. For the detection of metal ions, synthesized nanocomposite was analyzed to sense many metal ions (Ag+, Cd2+, Cu2+, Fe3+, Hg2+, Mo2+, Ni2+, and Zn2+) and we observed strong binding mood against Fe3+ ions having LOD and LOQ value of 0.0032 μM and 0.01 μM respectively.

scholarly journals Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Thu Dieu Le ◽  
Luyen Thi Tran ◽  
Hue Thi Minh Dang ◽  
Thi Thu Huyen Tran ◽  
Hoang Vinh Tran
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Metal Treatment ◽  
Pseudo Second Order ◽  
Adsorption Of Co2

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co2+) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe3O4) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe3O4 nanocomposite was applied for Co2+ ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite followed the pseudo-second-order kinetic model with the rate constant k2 being 0.0026 (g mg−1·min−1). The Langmuir model is suitable to describe the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite with the maximum sorption capacity (qmax) reaching 373.37 mg·g−1. The obtained results also indicated that the GO/PVA/Fe3O4 nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe3O4 nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.

scholarly journals A chitosan fiber as green material for removing Cr(VI) ions and Cu(II) ions pollutants

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shujie Zhang ◽  
Yating Zhang ◽  
Lisong Fu ◽  
Mengke Jing
Keyword(s):  
Metal Ions ◽  
Adsorption Process ◽  
Ph Value ◽  
Copper Ions ◽  
Physical Adsorption ◽  
Thermodynamic Characteristics ◽  
Fiber Material ◽  
Thermal Reaction ◽  
Order Kinetic ◽  
Chromium Ions

AbstractThe application shell uses cellulose as a green and recyclable fiber material, which has great value in the field of water treatment environment. Varying factors, including pH value, dosage of CS, reaction time and original Cr(VI) ions and Cu(II) ions were studied to investigate the Cr(VI) and Cu(II) ions removal efficiency. The obtained shell trichlorocellulose has better permeability to copper ions, which is mainly due to the different oxide states of copper ions and chromium ions in a pH environment, which lead to different combinations. The price of shell cellulose neutralization is relatively low. Metal ions have better absorption properties. The kinetic and thermodynamic characteristics of the adsorption process of copper ions by chitosan yarns were discussed. The adsorption process of copper ions conformed to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption of copper ions by the yarn is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. Compared with chromium ions, chitosan fibers have better adsorption of copper ions, which is mainly because the amino groups in chitosan fibers can have good chelation with copper ions. SEM, FTIR, XRD were used to characterize the adsorption of copper ions by chitosan fibers, and the mechanism of the adsorption of metal ions by chitosan fibers was explored.

scholarly journals Sample Preparation Using Graphene-Oxide-Derived Nanomaterials for the Extraction of Metals

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2411 ◽  
Author(s):  
Natalia Manousi ◽  
Erwin Rosenberg ◽  
Eleni A. Deliyanni ◽  
George A. Zachariadis
Keyword(s):  
Graphene Oxide ◽  
Metal Ions ◽  
Environmental Remediation ◽  
Deep Eutectic Solvents ◽  
Food Samples ◽  
Single Atom ◽  
Functionalized Graphene Oxide ◽  
Heterogenous Catalysis ◽  
Analytical Technique ◽  
Atom Layer

Graphene oxide is a compound with a form similar to graphene, composed of carbon atoms in a sp2 single-atom layer of a hybrid connection. Due to its significant surface area and its good mechanical and thermal stability, graphene oxide has a plethora of applications in various scientific fields including heterogenous catalysis, gas storage, environmental remediation, etc. In analytical chemistry, graphene oxide has been successfully employed for the extraction and preconcentration of organic compounds, metal ions, and proteins. Since graphene oxide sheets are negatively charged in aqueous solutions, the material and its derivatives are ideal sorbents to bind with metal ions. To date, various graphene oxide nanocomposites have been successfully synthesized and evaluated for the extraction and preconcentration of metal ions from biological, environmental, agricultural, and food samples. In this review article, we aim to discuss the application of graphene oxide and functionalized graphene oxide nanocomposites for the extraction of metal ions prior to their determination via an instrumental analytical technique. Applications of ionic liquids and deep eutectic solvents for the modification of graphene oxide and its functionalized derivatives are also discussed.

scholarly journals Crown Ether Grafted Graphene Oxide/Chitosan/Polyvinyl Alcohol Nanofiber Membrane for Highly Selective Adsorption and Separation of Lithium Ion

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2668
Author(s):  
Xudong Zheng ◽  
Ang Li ◽  
Jie Hua ◽  
Yuzhe Zhang ◽  
Zhongyu Li
Keyword(s):  
Graphene Oxide ◽  
Crown Ether ◽  
Polyvinyl Alcohol ◽  
Adsorption Capacity ◽  
Selective Adsorption ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Nanofiber Membrane ◽  
Functionalized Graphene Oxide ◽  
Static Adsorption

Nanofiber membranes were successfully prepared with crown ether (CE) functionalized graphene oxide (GO), chitosan (CS), and polyvinyl alcohol (PVA) by low-temperature thermally induced liquid–liquid phase separation. The physical and chemical properties and adsorption performance of nanofiber membrane were studied through SEM, FT-IR, XRD, and static adsorption experiments. The results show that the specific surface area of the nanofiber membrane is as high as 101.5 m2∙g−1. The results of static adsorption experiments show that the maximum adsorption capacity of the nanofiber membrane can reach 168.50 mg∙g−1 when the pH is 7.0. In the selective adsorption experiment, the nanofiber membrane showed high selectivity for Li+ in salt lake brine. After five cycles, the material still retains 88.31% of the adsorption capacity. Therefore, it is proved that the material has good regeneration ability.

Sign in / Sign up

Export Citation Format

Share Document